Molding machine



A ril 15, 1958 R. w. TACCONE' MOLDING MACHINE Filed Nov. 25, 1955 FIG.I

INVENTOR.

RUSSELL W. TACCONE United Sitates Patent MOLDING MACHINE Russell W.Taccone, Erie, Pa., assignor to Taccone Pneumatic Foundry EquipmentCorporation, North East Township, Erie County, Pa., a corporation ofPennsylvama Application November 25, 1955, Serial No. 548,847

2 Claims. (Cl. 22-40) This invention relates to molding machines andmore particularly to molding machines ultilizing diaphragms forcompressing molding material in a flask around a pattern.

The purpose of the present invention is to overcome the diificultiesfrequently encountered in diaphragmmolding in that the molding materialaround the edges of the pattern is not compacted as firmly as thematerial over the top of thepattern. This results in a mold of lessquality than molds wherein the material is packed uniformly throughout.The present disclosure provides a simple economical means for compactingthe sand around the sides of the pattern by deflecting the diaphragm ina molding machine.

It is, accordingly, an object of this invention to provide a moldingmachine which is simple in construction, economical to manufacture, andsimple and eflicient to use.

Another object of this invention is to provide a molding machine whichwill compact the molding material in a mold evenly and uniformly aroundthe pattern.

Another object of the invention is to provide a machine utilizing adiaphragm for compacting molding material wherein the diaphragm isdeflected from its natural movement so as to change the direction offorce of the diaphragm on various parts of the molding material.

With the above and other objects in view, the present invention consistsof the combination and arrangement of parts hereinafter more fullydescribed, illustrated in the accompanying drawing and more particularlypointed out in the appended claims, it being understood that changes maybe made in the form, size, proportions, and minor details of contructionwithout departing from the spirit or sacrificing any of the advantagesof the invention.

In the drawing:

Fig. 1 is a transverse cross sectional view of a molding machineaccording to the invention.

Now with more specific reference to the drawing, the molding machine ismade up of a base having bored bosses 11 at either side thereof whichreceive the lower end of upwardly extending columns 12. The columns 12have shoulders 13 which rest on top of the bosses 11 and are held inplace by means of nuts 14. The upper ends of the columns 12 are threadedat 15 and are received in the bores of bosses 16 with nuts 17 supportingthe bosses 16 attached to a head 18. Nuts 49 are threadably attached tothe upper threaded ends of the columns 12.

The head 18 supports a blower 19 which exhausts a cavity 20 in a tank 41behind a diaphragm 22 in the manner disclosed in Patent No. 2,715,758. Apipe 21 is provided through which a source of compressed air may beselectively discharged into the cavity 20 behind the diaphragm 22. Thediaphragm 22 is attached to downwardly extending edges 23 of the tank 41and a plate 24 is attached to a flange 25 of the tank 41 and extendsinwardly at 26 to support a horizontally disposed portion 27 of thediaphragm 22.

A flask 29 is adapted to be supported on a pattern plate 30 which is inturn supported on a car 31. A pattern 32 of the required Shape isattached to the pattern plate 30. Molding material 34 such as foundrysand can be disposed around the pattern 32 and packed therearound aswill be explained later.

The vacuum induced by means of the blower 19 behind the diaphragm 22drives the diaphragm 22 up into the cavity 20. Then the car 31 havingthe pattern plate 30 and the flask 29 thereon with molding material 34therein is moved under the head 18 and air pressure from the source 21is applied behind the diaphragm 22 which causes it to compress themolding material 34 in the flask 29. The molding material at the centralpart of the flask 29 at 37 is compressed by the diaphragm 22 to acertain degree. The molding material around the sides at 38 iscompressed downwardly by overlapping portions 39 of the diaphragm 22.Therefore, the molding material is compressed more around the edges thanit would ordinarily be.

The foregoing specification sets forth the invention in its preferredpractical forms but the structure shown in capable of modificationwithin arange of equivalents without departing from the invention whichis to be understood is broadly novel as in commensurate with theappended claims.

The embodiments of the invention in which an exclusive property orprivilege is claimed are defined as follows:

1. A molding machine comprising a molding machine head having adownwardly opening cavity defined by a tank, means to support a flaskbelow said tank, said flask being supported on said means, said flaskbeing substantially coextensive with said downwardly opening tank, adiaphragm support comprising a flat plate having an opening through thecenter thereof, said plate extending inwardly from the edges of saidtank forming a shelf and adapted to extend over molding material adaptedto be contained in said flask, a pattern plate, said pattern plateclosing the side of said flask opposite said tank, a pattern on saidpattern plate extending into said flask and spaced inwardly from theedges thereof, said shelf extending over said molding material at leastas far as the edges of said pattern, a diaphragm attached to the loweredges of said tank and overlying said diaphragm support, means to applya vacuum to said tank whereby said diaphragm may be drawn up thereinto,and means to apply a pressure in said tank behind said diaphragm wherebysaid diaphragm is forced into engagement with said molding materialadapted to be contained in said flask, said diaphragm adapted to beurged outwardly under said diaphragm support and downward- 1y,compressing said molding material around the edges of said patternadapted to be supported in said flask and to applying a pressure to saidmolding material above said pattern.

2. The molding machine recited in claim 1 wherein said tank has a lowerperipheral edge thereon and said diaphragm is clamped between said tankand said diaphragm support.

References Cited in the file of this patent UNITED STATES PATENTS989,578 Deville Apr. 18, 1911 2,588,669 Taccone (A) Mar. 11, 19522,715,758 Taccone (B) Aug. 23, 1955 FOREIGN PATENTS 460,014 France Nov.21, 1913 801,574 Germany Jan. 11, 1951

